Publication Abstract

Proceedings - Fourth International Conference - Piling and Deep Foundations, 1991, Stresa, Italy, (DFI)

Laterally Loaded Pile Under Large Deflection
M. Okahara & S. Nakatani Public Works Research Institute, Ministry of Construction, Tsukuba, Japan T. Asama, M. Miki, S. Koyama & R. Ueno Japanese Association for Steel Pipe Piles, Tokyo, Japan

Experimental and analytical studies were done on the nonlinear behavior of laterally loaded pile under large deflection in elasto-plastic soil. The test of a laterally loaded pile was carried out in artificial sandy ground in order to develop the calculation method for the interaction behavior between pile and elasto-plastic soil. The test results showed that ultimate subgrade reaction on pile was about three times as large as the passive earth pressure in the deep layer down from the depth around two and a half times pile diameter, but smaller than it in the shallow layer. Calibration calculations were made to examine the interaction behavior between piles and soils for seven single pile loading tests in both sand and clay including the said test. Also group pile analysis had been done for 2 x 2 piles loading test. The following assumptions were adopted into the calculation method. (1) Pile is regarded as elastic beam. (2) The p-y curve of soil is modeled by bilinear relation and its ultimate value is two and a half times as large as the passive earth pressure. The consequence showed that this calculation method was available for analyzing laterally loaded pile under large deflection in elasto-plastic sandy ground.

 article #502; publication #37 (IC-1991-IT)